Description:

The Tier 1 Rice Model estimates screening level aquatic concentrations of pesticides in rice paddies. It is a simple pesticide soil:water partitioning model with default values for water volume, soil mass, and organic carbon. Pesticide degradation is not considered in the model.

Record Details:

Record Type:MODEL

Record Released:11/18/2009

Record Last Revised:11/18/2009

Record ID: 216545

Show Additional Record Data

Model Detail:

Model Evaluation :Because the model is a screening-level exposure model, it has undergone an analysis to ensure the model predicted EECs are higher than measured pesticide concentrations in rice paddy studies. The default model parameters (water depth, sediment bulk density, porosity, and soil organic carbon content, and sediment interaction depths) were determined from typical literature values or by calibration. Model was evaluated by comparisons with 5 field studies and shown to be appropriately protective.

Model URL :http://www.epa.gov/oppefed1/models/water/index.htm#rice

Model Guidance Documents :http://www.epa.gov/oppefed1/models/water/index.htm#rice

Model Download Information :http://www.epa.gov/oppefed1/models/water/index.htm#rice

modelcontactinfo :Agency Contact:
Dirk Young, Ph.D.
Model Coordinator
USEPA/OPP/EFED
Young.dirk@epa.gov
(703)-605-0206

Developer Contact
James A. Hetrick, Ph.D.
Senior Science Advisor
USEPA/OPP/EFED
hetrick.jame@epa.gov
(703)-305-5237

Model Inputs :Pesticide application rate
Pesticide soil:water partitioning coefficient (Kd or Koc)

Model Outputs :A single estimate of pesticide concentration in water

otheruserdocs :User Guide includes theory, calibrations, and evaluations.

Model Computer Requirements:

Model Operating Systems Needs :N/A

Model Hardware Needs :Calculations may be performed without a computer.

other_req :None